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Schizophrenia: DSM- IV
Characteristic symptoms: Two (or more) of the following, each present for a significant portion of time during a 1-month period (or less if successfully treated):
* delusions
* hallucinations
* disorganized speech (e.g., frequent
derailment or incoherence)
* grossly disorganized or catatonic behavior
* negative symptoms, i.e., affective flattening,
alogia, or avolition